\lhead {
	\setlength{\unitlength}{5mm} 
	\begin{picture}(0,0) 
		\includegraphics[scale=0.75]{img/header.pdf} 
	\end{picture} 
	\textsf{\vspace{1cm}}
}

\chead{}
\rhead{}
\renewcommand{\headrulewidth}{0pt}
